Sheet-feeding mechanism.



PATENTED JULY 17; 1906.

A. ROSENFELD. SHEET FEEDING MECHANISM.

APPLICATION FILED DEG. 9, 1903.

2 SHEETS-SHEET 1.

Witnesses;

$4M f/Q THE NORRIS PETERS cm, WASHINGTON, a. c.

PATENTED JULY 17, 1906.

A. ROSENFELD. SHEET FEEDING MECHANISM.

APPLIQATION FILED DEC. 9, 1906 2 SHEETS-SHEET 2.

TH: uonms PETERS 120., wnsnmc'mu, n. c.

UNITED STATES PATENT oFFIoR.

SHEET-FEEDING MECHANISM.

Specification of Letters Patent.

Patented July 1'7, 1906.

Application filed December 9,1903. Serial No.184.4=73.

To all whom it may concern:

Be it known that I, ARTHUR RosENFELD, engineer, a citizen of the Empireof Germany, residing at Vienna, in the Empire of Austria- Hungary, haveinvented certain new and useful Improvements in Sheet-Feeding Mechanism,of which the following is a specification, reference being had thereinto the accompanying drawings.

It is known in sheet-feeders for printingpresses, folding-machines, andother similar machines in which the sheets of paper uppermost are pushedforward over the front edge of the pile one after the other by anydevice for example, a friction deviceto utilize the movement of thesheets for bringing into action or releasing any kind of mechanism,mechanical or electrical, which on its part again brings into action asuitable device, which has a definite function to performfor instance,the stopping of the friction or other feeding device. For this purpose amovable lever or member is arranged in the path of the paper sheets,which member is operated by the edge of the advancing sheet of paper,and thereby brings into action or releases the above-mentionedmechanism. Such mechanisms hitherto known in connection withsheet-feeders all possess the defect that either they are not releasedwith suflicient ease by thin sheets or if this is the case'theirpoweras, for instance, a spring under tensionis not released withsufficient rapidity.

According to my present invention I employ toggle-levers inserted astransmitting medium between the releaser and the means to be released,together with an arm on the releaser-shaft and provided with apawltooth, and a pawl at the junction of the toggle-links adapted to bereleased by the move ment of the releaser.

The toggle levers are preferably so ar ranged that when the tensionmechanism is set the levers are stretched or extended almost intoalinement. In this position they are held by a pawl fitted in the jointof the togglelevers, which pawl engages with and behind a locking-hookfirmly secured to the releasing-lever. By the movement of this lever thepawl is released and the toggle-levers spring in. The lower end of thelower toggle-lever is in this arrangement journaled upon a fixed part ofthe frame, while at the upper end of the upper link thereof one arm of abell-crank lever is jointed, its other arm being pulled by a spring,which here represents the power tensioned and to be released. Thesetting of the lever transmission takes place suitably in this way, thatin the first place the arm of the bell-crank lever pressing on thetoggle linkage is lifted, whereby the pawl is again brought intoengagement with the locking-tooth of the releasing-lever. Thereupon thereleasing-lever, which was previously turned from the path of the sheetof paper, is swung back and with its lockingtooth carries the pawl ofthe toggle linkage, so that this latter is again tensioned or set. Inregard to a secure locking it is advantageous to here adopt anarrangement which at the leading back of the pawl renders possible agreater engagement of the locking-hook and the pawl than is suitable atthe moment of release, which, however, shortly before the end of thereturn movement makes this engagement so sensitive that aproportionately slight movement of the releasing-leveris quitesufficient to release the tension mechanism.

The accompanying drawings represent, partially in diagram, examples oftension mechanism according to the invention.

Figure 1 is a side view of a simple tension mechanism with simple togglelinkage in the position of rest. Fig. 2 is a plan thereof. Fig. 3represents in end view a form of toggle linkage. Fig. 4 shows thereleasing device in the working position. Fig.- 5 represents the mannerand fashion in which the tension mechanism is set.

In the machine-frame 1, Fig. 1, the releas ing-lever 3 is supported onthe shaft 2, the lever being bent to a right angle at the bottom andextending under the supply-table 4 for the sheets of paper, so that thesheet is prevented from bending out. Over the table 4 are theusual-sheet-metal plates 5, intended to prevent the paper bending. Theshaft 2 is suitably journaled in ball or roller bearings. Further, onthis shaft 2 iskeyed an arm 6, carrying a pawl-tooth 7. This tooth 7normally holds the pawl 8, which is jointed at 9 to the toggle-levers10. The lower end of the lower toggle-lever 10 is pivoted on a pin 11,secured in the machine-frame 1, Figs. 1 and 3. To the upper end of theup er toggle-lever 10 is attached the arm 12 o a bell-crank leverpivoted on the bolt 13 of the machine-table. To the other arm 14 of thisbell-crank lever is attached a spring 15, whose other end is secured toa fixed arm 16 of the machine-frame. If now by the advance of the sheetof paper 17, Fig. 4, the releasing-lever is moved, then the arm 6, withits pawl-tooth '7, turns downward and releases the pawl 8. Thetogglelevers spring together, and the spring can now exert its force.

In order to let the sheet 17 go smoothly through, the releasing-lever 3must be swung out from the position of Fig. 4. The movement necessarytherefor is advantageously utilized also for again setting the tensionmechanism; but this can be attained in any other suitable manner. Therelease of the tension mechanism takes place early enough also when, forexample, the following sheet is advanced too far, so that thereleasing-lever and the arm 6 cannot take up their end position. (Shownin Fig. 1.) In this case the releasing-lever and the arm 6 are held bythe paper sheet while the other parts of the releasing mechanism aremoved into the initial position, whereby the pawl 8 is again re leased.

In order to lead back the lever transmis sion in the manner denoted,there is on the shaft 2 a sleeve 18, which on the one side is providedwith an arm 19, on which is jointed a draw-rod 20. On the other sidethere is on the sleeve an arm 21, carrying a roller 22, lying under thearm 12 Further, on the sleeve there are two catches or lugs 23 and 24,which engage, respectively, the upper and lower sides of the arm 6,allowing this latter, however, the necessary play for releasing the pawland limiting the movement imparted to it by the sheets. When the sleeve18 rotates in either direction, the arm 6, and with it thereleasing-lever 3, is moved by the lugs 23 241 after a slight intervalor period of lost motion. After the device has assumed the positionshown in Fig. 4 the draw-rod is moved by any of the driving parts of thesheet-feeders, so that the parts assume the position shown in Fig. 5.I/Vhen the mechanism is in this position, the arm 22, with its roller,is lifted and raises the arm 12, which again takes up almost theposition shown in Fig. 1. The toggle-levers are thereby almost extendedinto alinement. The upper lug 23 presses against the arm 6 and carriessame downward, so that simultaneously the releasing-lever is swung outof the path of the sheet of paper. The sheet of paper then passesthrough other usual mechanism. The pawl 8, in consequence of thestretching of the toggle-links is again advanced to the left, so that itfalls over the pawl-tooth 7. Now a return movement of the rod 20 takesplace and also a return movement of the parts secured to the sleeve 18.In this position of the mechanism the pawl 8 is in such a degree ofengagement with the tooth 7 for the moment of release by the sheet thata snapping off is not possible even if it is considered that by thebackward movement of the roller 22 the leverarm 12 has a tendency tomove toward the toggle-levers; but when the releasing-lever follows themovement of sleeve 18, as above mentioned, the pawl-tooth 7 draws thepawl a little more, and so the toggle-levers are drawn back againcompletely into the position shown in Fig. 1. Just at the end of theback movement the pawl 8 is slightly lifted by a lug 25, which is alsoon the sleeve, and so the engagement of pawl 8 and tooth 7 is reduced tothe sensitiveness requisite for the moment of release. Thus, on the onehand, the engagement between pawl-tooth and pawl 8 during the return ofthe rel'easingle ver into its working position is entirely andthoroughly secure, so that the releasing of the tension mechanism inconsequence of any shocks whatever arising cannot take placeprematurely, and, on the other hand, the tension mechanism at theconclusion of this movement is prepared for the next release.

Having thus described my invention, what I claim is 1. In a device ofthe character described the combination with a releaser, of togglelinksinterposed between the means to be released and the releaser, thereleaser-shaft, an arm thereon provided with a pawl-tooth, a pawl at thejunction of the toggle links adapted to engage said pawl-tooth and to bereleased by the movement of the releaser.

2. In a device of the character described the combination with abent-spring releaserlever, of toggle-links interposed between the meansto be released and the releaser, the releaser-shaft, an arm thereonprovided with a pawl-tooth a pawl at the junction of the toggle-linksadapted to be released by the movement of the releaser.

3. In a device of the character described the combination with abent-spring releaserlever, of toggle-links interposed between the meansto be released and the releaser, the releaser-shaft, an arm thereonprovided with a pawl-tooth, a pawl at the junction of the toggle-linksadapted to engage said pawl-tooth and to be released by the movement ofthe releaser, a bell-crank lever connected with said toggle-links, and aspring connected with a short arm of said lever.

4. In a device of the character described the combination with abent-spring releaserlever, of toggle-links interposed between the meansto be released and the releaser, the releaser-shaft, an arm thereonprovided with a pawl-tooth, a pawl at the junction of the toggle-linksadapted to engage said pawl-tooth and to be released by the movement ofthe releaser, a bell-crank lever connected with said toggle-links, and aspring connected with a short arm of said lever, a sleeve on thereleasershaft having an arm means for actuating said sleeve and a rollercarried by said arm and lying under the long arm of the bell-cranklever.

5. In a device of the character described the combination with abent-spring releaserlever, of toggle-links interposed between the meansto be released and the releaser, the releaser-shaft, an arm thereonprovided with a pawl-tooth, a pawl at the junction of the toggle-linksadapted to engage said pawl-tooth and to be released by the movement ofthe releaser, a bell-crank lever connected with a short arm of saidlever, a sleeve on the releaser-shaft having an arm and a roller carriedby said arm and lying under the long arm of the bell-crank lever, andlugs on said sleeve and adapted to be disposed on opposite sides of thearm carrying the pawl-tooth and means for actuating said sleeve.

6. In a device of the character described the combination with abent-spring releaser= lever, of toggle-links interposed between themeans to be released and the releaser, the releaser-shaft, and an armthereon provided with a pawl-tooth, a pawl at the junction of thetoggle-links adapted to be released by the movement of the releaser, abell-crank lever connected with a short arm of said lever, a sleeve onthe releaser-shaft, having an arm means for actuating said sleeve aroller carried by said arm and lying under the long arm of thebell-crank lever, and lugs on said sleeve and adapted to be disposed onopposite sides of the arm carrying the pawl-tooth and a further lug onsaid sleeve for lifting said pawl at predetermined periods.

In testimony whereof I hereunto afiiX my signature in presence of twowitnesses.

ARTHUR ROSENFELD.

WVitnesses:

FRIEDRICH BINDER, ALvEs'ro S. HOGUE.

